Step 1: What you need.
Step 2: Preparing the tin and cotton.
Take the tin and using your tin opener or a nail and hammer, make a small hole in the top of the tin.
Then take your cotton. Cut it into lenths about 3cm wide and then cut your strip into 3cm squares.
Dont worry about the cotton fraying.
Step 3: Making the char cloth.
Put the lid back on.
Step 4: The easy bit.
You can use an incinerator or a fireplace in a house to make char cloth.
Step 5: Final bit.
This doesn't always work, but it tends to.
This is not something I am taking credit for as it was not my idea, but I want other people to know how to make it the way I do.